estimateUserOperationGas on smart account clients no longer supported

[avarobinson]

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[REQUIRED] Environment

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[REQUIRED] Describe the problem

estimateUserOperationGas no longer supported as a client action (only available as a bundler action). Docs are out of date and smart account client support will not be available in v4 of the SDK. Instead, developers should use buildUserOperation instead.

How to reproduce:

Relevant code or sample repro: